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Diffstat (limited to 'src/emu/cpu/rsp/vabs.h')
-rw-r--r--src/emu/cpu/rsp/vabs.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/emu/cpu/rsp/vabs.h b/src/emu/cpu/rsp/vabs.h
new file mode 100644
index 00000000000..273841b9610
--- /dev/null
+++ b/src/emu/cpu/rsp/vabs.h
@@ -0,0 +1,15 @@
+// license:BSD-3-Clause
+// copyright-holders:Tyler J. Stachecki,Ryan Holtz
+
+inline rsp_vec_t vec_vabs(rsp_vec_t vs, rsp_vec_t vt, rsp_vec_t zero, rsp_vec_t *acc_lo)
+{
+ rsp_vec_t vs_zero = _mm_cmpeq_epi16(vs, zero);
+ rsp_vec_t sign_lt = _mm_srai_epi16(vs, 15);
+ rsp_vec_t vd = _mm_andnot_si128(vs_zero, vt);
+
+ // Careful: if VT = 0x8000 and VS is negative,
+ // acc_lo will be 0x8000 but vd will be 0x7FFF.
+ vd = _mm_xor_si128(vd, sign_lt);
+ *acc_lo = _mm_sub_epi16(vd, sign_lt);
+ return _mm_subs_epi16(vd, sign_lt);
+}